This analog meter circuit was found in the September 1989 issue of Radio Electronics magazine. The source must be dual, and the table gives the resistors for the various scales.
Found in American documentation from the 1970s, this circuit can be designed based on a modern SCR,...
This circuit was found in an English magazine from 1978, but it is current and the common 2N3055 can...
This circuit was found in an American documentation from the 90's. What it does is provide at the...